Not so common seal

[elps99]

Hi

Just to share a pot 1970s with not so common seal
This pot use less than 3 time

[chrl42]

Looking at 製, it's after 30s. After-30s 6-letter seals can narrow down to few. Most of them are used by Factory-1 during 5~70s.

That four-leg 溪 only have 荊溪惠孟臣製, 荊溪南孟臣製 (your seal) has a different shape of 溪. Which leads me to understand as 'imitation'.

I attached 6-letter seals used during 30~early-70s. Compare with them.